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Add an option to print the java memory before/after mojo execution #4529

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merged 1 commit into from
Dec 16, 2024
Merged

Add an option to print the java memory before/after mojo execution #4529

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62 changes: 62 additions & 0 deletions tycho-spi/src/main/java/org/eclipse/tycho/helper/MojoExecutionHelper.java
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Original file line number Diff line number Diff line change
Expand Up @@ -19,25 +19,41 @@
import org.apache.maven.plugin.MojoExecution;
import org.apache.maven.plugin.MojoExecutionException;
import org.codehaus.plexus.component.annotations.Component;
import org.codehaus.plexus.component.annotations.Requirement;
import org.codehaus.plexus.logging.Logger;

@Component(role = MojoExecutionListener.class, hint = "helper")
public class MojoExecutionHelper implements MojoExecutionListener {
private static boolean printMemoryInfo = Boolean.getBoolean("tycho.printMemory");
private static boolean gc = Boolean.getBoolean("tycho.printMemory.gc");

private static final ThreadLocal<MojoExecutionEvent> EVENT = new ThreadLocal<MojoExecutionEvent>();

@Requirement
private Logger logger;

@Override
public void beforeMojoExecution(MojoExecutionEvent event) throws MojoExecutionException {
EVENT.set(event);
if (printMemoryInfo) {
printMemory("Before", gc, event);
}
}

@Override
public void afterMojoExecutionSuccess(MojoExecutionEvent event) throws MojoExecutionException {
EVENT.remove();
if (printMemoryInfo) {
printMemory("After", gc, event);
}
}

@Override
public void afterExecutionFailure(MojoExecutionEvent event) {
EVENT.remove();
if (printMemoryInfo) {
printMemory("After", gc, event);
}
}

public static Optional<MojoExecution> getExecution() {
Expand All @@ -48,4 +64,50 @@ public static Optional<MojoExecution> getExecution() {
return Optional.ofNullable(executionEvent.getExecution());
}

private void printMemory(String state, boolean gc, MojoExecutionEvent evt) {
Runtime runtime = Runtime.getRuntime();
double usedBefore;
if (gc) {
usedBefore = (runtime.totalMemory() - runtime.freeMemory()) / 1024 / 1024;
System.gc();
} else {
usedBefore = 0;
}
double totalMemory = runtime.totalMemory() / 1024 / 1024;
double freeMemory = runtime.freeMemory() / 1024 / 1024;
double usedMemory = totalMemory - freeMemory;
StringBuilder builder = new StringBuilder();
builder.append("---- ");
builder.append(state);
builder.append(" ");
builder.append(evt.getProject().getId());
builder.append(" - ");
MojoExecution execution = evt.getExecution();
builder.append(execution.getMojoDescriptor().getId());
builder.append(" [");
builder.append(execution.getExecutionId());
builder.append("] ----");
builder.append(System.lineSeparator());
builder.append("Total Memory: ");
builder.append(String.format("%.2f", totalMemory));
builder.append("mb");
builder.append(System.lineSeparator());
builder.append("Free Memory: ");
builder.append(String.format("%.2f", freeMemory));
builder.append("mb");
builder.append(System.lineSeparator());
builder.append("Used Memory: ");
builder.append(String.format("%.2f", usedMemory));
builder.append("mb");
builder.append(System.lineSeparator());
double reclaimed = usedBefore - usedMemory;
if (reclaimed > 0) {
builder.append("GC Reclaimed: ");
builder.append(String.format("%.2f", reclaimed));
builder.append("mb");
builder.append(System.lineSeparator());
}
logger.info(builder.toString());
}

}
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